ISO Fixed Bolted Blank Flanges are used to cap off the open ports where not required and are also used as a base part to manufacture adaptor fittings, instruments, feedthroughs etc.Manufactured from: 304 Stainless Steel. ISO Fixed Bolted Blank Flanges are supplied in a plastic bag.ISO Fixed Bolted Blank Flanges are manufactured to the ISO Standard and are compatible with other supplier’s product.